English dictionary of medical terms (41)
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- No:800 - hyperpyrexia
exceptionally high fever either in comparison of the fever usually
accompanying a particular disease or absolutely (as in heat
- No:801 - hyperreflexia
(hyper- + reflex + -ia) exaggeration of reflexes.
- No:802 - hypersecretion
- No:803 - hypersensitivity
a state of altered reactivity in which the body reacts with an
exaggerated immune response to a foreign substance.
Hypersensitivity reactions are classified as immediate or delayed,
types I and IV, respectively, in the Gell and Coombs classification
(q.v.) of immune responses.
- No:804 - hyperstimulation
- No:805 - hypertension
(hyper- + tension) persistently high arterial blood pressure.
Various criteria for its threshold have been suggested, ranging
from 140 mm. Hg systolic and 90 mm. Hg diastolic to as high as 200
mm. Hg systolic and 110 mm. Hg diastolic. Hypertension may have no
known cause (essential or idiopathic h.) or be associated with
other primary diseases (secondary h.).
- No:806 - hyperthermia
(hyper- + Gr. therm heat + -ia) abnormally high body temperature,
especially that induced for therapeutic purposes.
- No:807 - hyperthyroidism
1. excessive functional activity of the thyroid gland. 2. the
abnormal condition resulting from hyperthyroidism marked by
increased metabolic rate, enlargement of the thyroid gland, rapid
heart rate, high blood pressure, and various secondary symptoms.
- No:808 - hypertonia
or hypertony n, pl. hypertonias or hypertonies : hypertonicity. n.
Pathology: increased rigidity, tension and spasticity of the
- No:809 - hypertrichosis
(hyper + Gr. thrix hair + -osis) excessive growth of the hair.
Called also polytrichia and polytrichosis. Cf. hirsutism.
- No:810 - hypertrophy
(hyper- + Gr. troph) nutrition) the enlargement or overgrowth of
an organ or part due to an increase in size of its constituent
cells. Cf. hyperplasia.
- No:811 - hyperuricaemia
excess of uric acid or urates in the blood; it is a prerequisite
for the development or gout and may lead to renal disease. Called
also uricacidaemia and, formerly, lithemia.
- No:812 - hyperventilation
a state in which there is an increased amount of air entering the
pulmonary alveoli (increased alveolar ventilation), resulting in
reduction of carbon dioxide tension and eventually leading to
- No:813 - hypervitaminosis
a condition due to ingestion of an excess of one or more vitamins;
called also supervitaminosis.
- No:814 - hypervolaemia
(hyper- + volume + Gr. haima blood + -ia) abnormal increase in the
volume of circulating fluid (plasma) in the body.
- No:815 - hypnotic
(Gr. hypnotikos) a drug that acts to induce sleep.
- No:816 - hypoacusis or hypacusis
(hypo- Gr. akousis hearing) slightly diminished auditory
sensitivity, with hearing threshold levels above the normal limit
so that the impairment is measurable in decibels.
- No:817 - hypochondriasis
(so called because it was supposed by the ancients to be due to
disturbed function of the organs of the upper abdomen) (DSM III-R)
a mental disorder characterized by a preoccupation with bodily
functions and the interpretation of normal sensations (such as
heart beats, sweating, peristaltic action, and bowel movements) or
minor abnormalities (such as a runny nose, minor aches and pains,
or slightly swollen lymph nodes) as indications of highly
disturbing problems needing medical attention. Negative results of
diagnostic evaluations and reassurance by physicians only increase
the patient's anxious concern about his health, and the patient
continues to seek medical attention. Called also hypochondriacal
- No:818 - hypodermic
(hypo- + Gr. derma skin) applied or administered beneath the skin.
- No:819 - hypoglycaemia
(hypo- + Gr. glykys sweet + haima blood + -ia) an abnormally
diminished concentration of glucose in the blood, which may lead to
tremulousness, cold sweat, piloerection, hypothermia, and headache,
accompanied by irritability, confusion, hallucinations, bizarre
behaviour, and ultimately, convulsions and coma.
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